logical component goups in 7.2

Hi,
could someone plz describe what exactly happens to the logical componts created in 7.1 during the upgrade to 7.2? I've read that they are autom. changed to logical component groups. But in 7.2 they are not accessable anymore. So, what does this mean for our VAR solman?
Here, we have hundreds of logical components across many solutions (each for a customer). We use these basically for EWA generation.
Do we need to re-create them after the upgrade?

Thanks.